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Income Tax - Movements of Deferred Income Tax Assets and Liabilities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income tax [Line Items]      
Effect of Retrospective Applicationof IFRS 9 (Note 5)   $ (883)  
Recognized in Profit or Loss $ (208) 101 $ (1,404)
Recognized in Other Comprehensive Income 450 347 349
Deferred tax asset [Member]      
Income tax [Line Items]      
Beginning balance 2,730 2,322 2,061
Recognized in Profit or Loss 374 64 (86)
Recognized in Other Comprehensive Income 450 344 347
Ending balance 3,554 2,730 2,322
Deferred tax asset [Member] | Present value of funded defined benefit obligation [Member]      
Income tax [Line Items]      
Beginning balance 1,723 1,374 1,206
Recognized in Profit or Loss 134 5 (179)
Recognized in Other Comprehensive Income 450 344 347
Ending balance 2,307 1,723 1,374
Deferred tax asset [Member] | Allowance for doubtful accounts [Member]      
Income tax [Line Items]      
Beginning balance 289 230 169
Recognized in Profit or Loss 146 59 61
Ending balance 435 289 230
Deferred tax asset [Member] | Share of profits of associates and joint ventures accounted for using equity method [Member]      
Income tax [Line Items]      
Beginning balance 331 330 325
Recognized in Profit or Loss 58 1 5
Ending balance 389 331 330
Deferred tax asset [Member] | Impairment loss on property, plant and equipment [Member]      
Income tax [Line Items]      
Beginning balance 112 122 44
Recognized in Profit or Loss (19) (10) 78
Ending balance 93 112 122
Deferred tax asset [Member] | Deferred revenue [Member]      
Income tax [Line Items]      
Beginning balance 106 117 136
Recognized in Profit or Loss 5 (11) (19)
Ending balance 111 106 117
Deferred tax asset [Member] | Valuation loss on inventory [Member]      
Income tax [Line Items]      
Beginning balance 23 20 33
Recognized in Profit or Loss 65 3 (13)
Ending balance 88 23 20
Deferred tax asset [Member] | Accrued award credits liabilities [Member]      
Income tax [Line Items]      
Beginning balance 15 20 22
Recognized in Profit or Loss (1) (5) (2)
Ending balance 14 15 20
Deferred tax asset [Member] | Warranties [Member]      
Income tax [Line Items]      
Beginning balance 22 19 18
Recognized in Profit or Loss 4 3 1
Ending balance 26 22 19
Deferred tax asset [Member] | Property, plant and equipment [member]      
Income tax [Line Items]      
Beginning balance 2 2 2
Ending balance 2 2 2
Deferred tax asset [Member] | Unrealised foreign exchange gains (losses) [Member]      
Income tax [Line Items]      
Beginning balance 17 0 18
Effect of Retrospective Applicationof IFRS 9 (Note 5) 0    
Recognized in Profit or Loss (16) 17 (18)
Ending balance 1 17 0
Deferred tax asset [Member] | Others [Member]      
Income tax [Line Items]      
Beginning balance 29 34 40
Recognized in Profit or Loss 8 (5) (6)
Ending balance 37 29 34
Deferred tax asset [Member] | Temporary differences [Member]      
Income tax [Line Items]      
Beginning balance 2,684 2,268 2,013
Recognized in Profit or Loss 379 72 (92)
Recognized in Other Comprehensive Income 450 344 347
Ending balance 3,513 2,684 2,268
Deferred tax asset [Member] | Unused tax losses [Member]      
Income tax [Line Items]      
Beginning balance 46 54 48
Recognized in Profit or Loss (5) (8) 6
Ending balance 41 46 54
Deferred tax asset [Member] | Trade-in right [Member]      
Income tax [Line Items]      
Beginning balance 15 0  
Effect of Retrospective Applicationof IFRS 9 (Note 5) 0    
Recognized in Profit or Loss (5) 15  
Ending balance 10 15 0
Deferred tax liability [Member]      
Income tax [Line Items]      
Beginning balance (1,430) (1,464) (148)
Effect of Retrospective Applicationof IFRS 9 (Note 5) 1    
Recognized in Profit or Loss (563) 31 (1,318)
Recognized in Other Comprehensive Income   3 2
Ending balance (1,992) (1,430) (1,464)
Deferred tax liability [Member] | Present value of funded defined benefit obligation [Member]      
Income tax [Line Items]      
Beginning balance (1,265) (1,269) (1)
Recognized in Profit or Loss (567) 4 (1,268)
Ending balance (1,832) (1,265) (1,269)
Deferred tax liability [Member] | Unrealised foreign exchange gains (losses) [Member]      
Income tax [Line Items]      
Beginning balance 0 (10) (1)
Recognized in Profit or Loss (1) 10 (9)
Ending balance (1) 0 (10)
Deferred tax liability [Member] | Others [Member]      
Income tax [Line Items]      
Beginning balance (1) (1) (1)
Recognized in Profit or Loss 0 0 0
Ending balance (1) (1) (1)
Deferred tax liability [Member] | Land value incremental tax [Member]      
Income tax [Line Items]      
Beginning balance (95) (95) (95)
Ending balance (95) (95) (95)
Deferred tax liability [Member] | Deferred revenue for award credits [Member]      
Income tax [Line Items]      
Beginning balance (29) (46) (2)
Recognized in Profit or Loss (2) 17 (44)
Ending balance (31) (29) (46)
Deferred tax liability [Member] | Intangible assets and goodwill [member]      
Income tax [Line Items]      
Beginning balance (39) (40) (43)
Recognized in Profit or Loss 7 1 3
Ending balance (32) (39) (40)
Deferred tax liability [Member] | Valuation gain or loss on financial instruments, net [Member]      
Income tax [Line Items]      
Beginning balance (1) (3) (5)
Effect of Retrospective Applicationof IFRS 9 (Note 5) 1    
Recognized in Profit or Loss 0 (1) 0
Recognized in Other Comprehensive Income 0 3 2
Ending balance $ 0 $ (1) $ (3)